I have a Nvidia 8800GTX and it has 2 power inputs in the card.

Until now i only have 1 power input plugged in. but i noticed that if i plug the power cable to the other input on the graphics card, it beeps when it starts up(and no picture will appear obviously). is this because the card is damaged or is it normal? ie. is it normal that if you plug the power in power input 'A' it works fine and if you plug it in power input 'B', the card beeps?

thanks in advance